diff --git a/lectures/additive_functionals.md b/lectures/additive_functionals.md
index 3d4893f5..7aace886 100644
--- a/lectures/additive_functionals.md
+++ b/lectures/additive_functionals.md
@@ -406,7 +406,7 @@ The code below adds some functions that generate plots for instances of the `AMF
 
 ```{code-cell} python3
 ---
-tags: [output_scroll]
+tags: [collapse-20]
 ---
 def plot_given_paths(amf, T, ypath, mpath, spath, tpath,
                     mbounds, sbounds, horline=0, show_trend=True):
diff --git a/lectures/chang_credible.md b/lectures/chang_credible.md
index 2c8adbd0..fd8e8a2d 100644
--- a/lectures/chang_credible.md
+++ b/lectures/chang_credible.md
@@ -810,7 +810,7 @@ The following code computes sustainable plans
 ```{code-cell} python3
 ---
 load: _static/lecture_specific/chang_credible/changecon.py
-tags: [output_scroll]
+tags: [collapse-20]
 ---
 ```
 
diff --git a/lectures/von_neumann_model.md b/lectures/von_neumann_model.md
index 0aec38e4..8fd23d66 100644
--- a/lectures/von_neumann_model.md
+++ b/lectures/von_neumann_model.md
@@ -61,7 +61,7 @@ The code below provides the `Neumann` class
 
 ```{code-cell} python3
 ---
-tags: [output_scroll]
+tags: [collapse-20]
 ---
 class Neumann(object):